车镇凹陷含油气系统划分及勘探方向

车镇凹陷是一个在对基底构造层长期改造基础上发展起来的中、新生代陆相断陷-拗陷叠合盆地,在车镇凹陷形成"一源多藏"和"一藏多源"的复合含油气系统.根据油源对比结果,将车镇凹陷复合含油气系统进一步划分为沙四段含油气系统、沙三段含油气系统、沙一段含油气系统.影响油气藏形成的各因素之间的良好配置有利于油气聚集.3个含油气系统具有不同的地质要素和成藏作用,分布范围也存在明显差别,表现出分层发育和垂向叠置的特征.分析不同区带的勘探资料,指出车西、大王北和郭局子洼陷是有利的勘探区带,埕子口、无棣、庆云凸起可作为后备勘探区带.

Division of petroluem system and exploration direction in Chezhen Sag

Chezhen Sag is a continental superimposed basin of faulting and downwarping in Mesozoic and Cenozoic.A composite petroleum system of one source corresponding to multiple reservoirs and one reservoir corresponding to multiple sources is formed in it.According to analysis of oil-source correlation,the composite petroleum system in Chezhen Sag can be divided into Es4 petroleum system,Es3 petroleum system and Es1 petroleum system.The good matching relations of pool-forming factors are favorable for hydrocarbon accumulation.The end of Oligocene is critical period of Es4 petroleum system,and the end of Miocene is critical period of Es3 petroleum system,in addition,critical period of Es1 petroleum system is not arrived.These three petroleum systems distribute in different strata and superpose each other.Chexi Subsag,Dawangbei Subsag and Guojuzi Subsag are advantageous exploration zones.Chengzikou Salient,Wudi Salient and Qingyun Salient are prospective exploration zones.